紫外照射对鲜切苹果营养品质的影响
Effect of ultraviolet irradiation on the nutritional quality of fresh- cut apples
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摘要: 为探索保鲜鲜切果蔬的新途径,以鲜切苹果为试材,研究了用紫外(UV-C)辐照不同时间(10、15、20 min)对常温贮藏下鲜切苹果营养品质的影响。在贮藏过程中测定鲜切苹果的多项营养指标。结果表明,用不同剂量的紫外照射处理,对于鲜切苹果的贮藏期营养品质影响不同。用20 W的紫外灯(254 nm)照射15 min,可以更好地抑制鲜切苹果贮藏期内可滴定酸、VC和还原糖含量的下降;并且使总糖和可溶性固形物含量保持最高水平,使鲜切苹果失重率维持最低水平,所以用20 W的紫外灯照射15 min,有利于保持鲜切苹果贮藏期内良好的营养品质。Abstract: In order to develop new methods to retain the freshness of fresh fresh- cut fruits and vegetables,the effect of different ultraviolet( UV- C) irradiation time on the nutritional components of fresh- cut apples stored in normal temperature were investigated,and many nutritional indexes of fresh- cut apples were analyzed at the setting time points during storage.The results showed that different ultraviolet( UV- C) irradiation time had different effect on the nutritional components of fresh- cut apples. Compared with control and other treatment groups,the contents of titratable acid,VC,reducing sugar for the group treated with irradiating for 15 minutes with 20 W UV lamp changed slowly,and the soluble solids and total sugar were kept at a high level,while the reductions of moisture was kept at a low level.So it was can be concluded that 15 minutes with 20 W UV lamp conld matain the nutritional components of fresh- cut apples during the storage.